Abstract
This study deals with the standing stability of two-wheeled vehicle at extremely low speed. Most of studies on vehicle behavior for two-wheeled vehicle are studying for characteristics beyond medium speed, and analyzes on low speed and stopped state characteristics have hardly been performed. Standing stability at extremely low speeds for two-wheeled vehicle is one of the major problems for ordinary riders. In this study, the equation of motion for two-wheeled vehicle at extremely low speed is constructed by two parts, one is the model for standing stability at zero speed, and the other is the geometrical model for vehicle trajectory. Using this equation of motion, it is shown that the effect of each design parameter on standing stability.